How severe is CVE-2023-53873?

CVE-2023-53873 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2023-53873 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-53873?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-53873 have an EU (EUVD) identifier?

Yes. CVE-2023-53873 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203415.

When was CVE-2023-53873 published?

CVE-2023-53873 was published on 2025-12-15 and last updated on 2026-06-17.

CVE-2023-53873

CVE-2023-53873 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203415
Weakness: CWE-400
Published: 2025-12-15
Last modified: 2026-06-17

Description

SyncBreeze 15.2.24 contains a denial of service vulnerability in the login authentication mechanism that allows attackers to crash the service. Attackers can send an oversized password parameter with repeated 'password=' values to overwhelm the login endpoint and potentially disrupt service availability.

Frequently asked questions

What is CVE-2023-53873?: SyncBreeze 15.2.24 contains a denial of service vulnerability in the login authentication mechanism that allows attackers to crash the service. Attackers can send an oversized password parameter with repeated 'password=' values to overwhelm the login endpoint and potentially disrupt service availability.
How severe is CVE-2023-53873?: CVE-2023-53873 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2023-53873 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-53873?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-53873 have an EU (EUVD) identifier?: Yes. CVE-2023-53873 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203415.
When was CVE-2023-53873 published?: CVE-2023-53873 was published on 2025-12-15 and last updated on 2026-06-17.

References

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